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A low pressure system will slide across the Four Corners on Tuesday, while a cold front will streak across the upper Midwest.

An area of low pressure will transition eastward over the Four Corners and the southern Plains. This system will usher moderate to heavy snow showers across the Rockies. Snow accumulations could range between 1 to 2 feet over parts of Colorado and southern Wyoming on Tuesday. Winter storm warnings are in place across a large span of the Intermountain West. In addition, light to moderate rain will be possible over the lower elevations of the Four Corners and the southern Plains. Conditions are expected to clear up across the West Coast.

Meanwhile, a cold frontal boundary will move east southeastward over the upper Midwest, the Mississippi Valley and the Great Lakes. This frontal boundary will generate a very active weather pattern across the central and eastern thirds of the country. A swath of heavy snow showers will develop ahead of this frontal boundary across the upper Midwest, the Great Lakes and the Northeast. Just south of the heavy snow, a mixture of rain, freezing rain and snow is expected over middle Mississippi Valley, the Ohio Valley and the interior Mid-Atlantic. An onshore flow from the Gulf of Mexico will aid in producing rain and thunderstorms over the lower Mississippi Valley, the Deep South, the Tennessee Valley and the southern Mid-Atlantic. Heavy precipitation will bring threats of flash flooding to northern Tennessee, Kentucky and West Virginia on Tuesday.

This year millions of Americans experienced either the warmest or coldest February for their locations, with records in some cases going back more than 100 years. A number of cities had their coldest average temperature for any month on record—truly stunning in a climate that’s running close to a record-high global air temperature. Meanwhile, February proved to be the warmest winter month ever documented across a huge swath of the West.

A violent F5 tornado moved through Jackson, Miss. on this date in 1966, killing 57 people. A dozen of the fatalities occurred as the tornado virtually destryoed a shopping center. Nearly 1,000 homes were destroyed and the damage from the storm was set at $18 million.